public bool Verify(byte[] sign, VPSS.PublicKeySystem publicKeySystem, byte[] data)
{
try
{
//Initiate Crypto Service
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
if (publicKeySystem == VPSS.PublicKeySystem.CheckOut)
{
rsa.ImportCspBlob(checkOutPublicKey);
}
else
if (publicKeySystem == VPSS.PublicKeySystem.vtcafes)
{
rsa.ImportCspBlob(vtcafesPublicKey);
}
else
if (publicKeySystem == VPSS.PublicKeySystem.OtherSystem)
{
rsa.ImportCspBlob(OtherSystemPublicKey);
}
else
{
rsa.ImportCspBlob(VPSSPublicKey);
}
//xac thuc
return(rsa.VerifyData(data, new SHA1CryptoServiceProvider(), sign));
}
catch
{
return(false);
}
}
//Mã hóa một string trả về Base64String
public string EncryptToBase64String(string data, VPSS.PublicKeySystem publicKeySystem)
{
byte[] plainbuffer = System.Text.Encoding.UTF8.GetBytes(data);
byte[] encryptbuffer = Encrypt(plainbuffer, publicKeySystem);
return(System.Convert.ToBase64String(encryptbuffer));
}
//Mã hóa dữ liệu nhiều khối
public byte[] Encrypt(byte[] data, VPSS.PublicKeySystem publicKeySystem)
{
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
//Chose where place to send data
if (publicKeySystem == VPSS.PublicKeySystem.CheckOut)
{
rsa.ImportCspBlob(checkOutPublicKey);
}
else
if (publicKeySystem == VPSS.PublicKeySystem.vtcafes)
{
rsa.ImportCspBlob(vtcafesPublicKey);
}
else
if (publicKeySystem == VPSS.PublicKeySystem.OtherSystem)
{
rsa.ImportCspBlob(OtherSystemPublicKey);
}
else
{
rsa.ImportCspBlob(VPSSPublicKey);
}
int block = (data.Length % DECRYPT_BLOCK != 0) ? data.Length / DECRYPT_BLOCK + 1 : data.Length / DECRYPT_BLOCK;
int length = (block == 0) ? DATA_BLOCK : block * DATA_BLOCK;
byte[] eData = new byte[length];
int i1 = 0, i2 = 0;
for (int i = 0; i < block - 1; i++)
{
byte[] t = new byte[DECRYPT_BLOCK];
for (int j = 0; j < DECRYPT_BLOCK; j++)
{
t[j] = data[i1++];
}
foreach (byte item in rsa.Encrypt(t, false))
{
eData[i2++] = item;
}
}
byte[] t1 = new byte[data.Length % DECRYPT_BLOCK];
for (int i = 0; i < t1.Length; i++)
{
t1[i] = data[i1++];
}
// Encrypt the last block
byte[] lastBlock = rsa.Encrypt(t1, false);
for (int i = 0; i < lastBlock.Length; i++)
{
eData[i2++] = lastBlock[i];
}
return(eData);
}
//Xác thực tham số dữ liệu
public bool Verify(string Base64sign, VPSS.PublicKeySystem publicKeySystem, params object[] data)
{
try
{
//Gop DL thanh một khối
System.Text.StringBuilder sb = new System.Text.StringBuilder();
foreach (var item in data)
{
sb.Append(item);
}
//Chuyển về byte array
byte[] dataBuffer = new System.Text.UTF8Encoding().GetBytes(sb.ToString());
//Chuyển chữ ký về mảng byte
byte[] signBuffer = System.Convert.FromBase64String(Base64sign);
//xác thực
return(Verify(signBuffer, publicKeySystem, dataBuffer));
}
catch
{
return(false);
}
}
